RU130EP Installation and Operation Manual

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Rinnai Tankless Water Heater Installation and Operation Manual 49

3. Common Vent (Indoor Units Only. Direct Vent and Non-Direct/Room Air Vent)

Common venting allows multiple RInnai Tankless Water

Heaters to share the same vent system. When operating

multiple water heaters in a common venting system, it

is recommended to use Rinnai’s EZConnect™ cable

(purchased separately) which electronically connect two

water heaters so they function as one hot water source.

Do not common vent this water heater with any other water

heater or appliance.

Common Vent Maximum Equivalent Vent Lengths

Common vent equivalent lengths include polypropylene pipe (PP) or PVC in a back-to-back or inline

conguration.

For the table below:

• Header is the main vent pipe into which sever-

al vents connect.

• Vent Length is the distance from the end of the

header to the vent termination.

• Maximum vent length starts at the end of the

header system.

Vent Length

Figure 49: Sample Inline, Freestanding

Conguration

Water Heater Model

# Water

Heaters

Max System Btu/hr

Vent Diameter

3 in. 4 in. 6 in.

RU199i (REU-N3237FF-US)

RU180i (REU-N2934FF-US)

2 398,000

360,000

65 ft

(20 m)

150 ft

(46 m)

150 ft

(46 m)

RU160i (REU-N2530FF-US)

RU130i (REU-N2024FF-US)

2 320,000

260,000

90 ft

(27 m)

150 ft

(46 m)

150 ft

(46 m)

Header

Figure 50

Table 21: Common Vent Maximum Vent Length

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Installation and Operation Manual - Page 49